updated build system

support/include/utils/error.hpp

@@ -119,6 +119,9 @@ struct spdlog_exception_handler final : public i_exception_handler {
 
   void handle_warn(std::string_view function_name,
                    std::string_view msg) const override;
+
+private:
+  iostream_exception_handler fallback{};
 };
 #endif // defined(PROJECT_ENABLE_SPDLOG) && defined(PROJECT_ENABLE_V2_ERRORS)